Force-transmitting arrangement for a valve train of an internal-combustion engine

Abstract

A force-transmitting arrangement ( 4 ) for a valve train ( 1 ) of an internal-combustion engine ( 2 ) with hydraulic valve play compensation device ( 6 ) with a hollow cylindrical compensation piston ( 15 ) is provided. The compensation piston ( 15 ) borders, on one end, a working space ( 32 ) of the valve play compensation device ( 6 ) and, on the other end, a hydraulic medium reservoir ( 33 ), which is used for supplying the working space ( 32 ) and which is connected to a hydraulic medium supply ( 18 ) of the internal-combustion engine ( 2 ). A run-off safety device ( 22, 22 a , 22 b ) at least partially prevents a hydraulic medium flow from the hydraulic medium reservoir ( 33 ) in the direction of the hydraulic medium supply ( 18 ). The hydraulic medium reservoir ( 33 ) includes an inner storage space ( 17 ) enclosed by the compensation piston ( 15 ) and at least one outer storage space ( 31 ) located outside the compensation piston ( 15 ), wherein the run-off safety device ( 22, 22 a , 22 b ) extends between the hydraulic medium supply ( 18 ) and hydraulic medium reservoir ( 33 ) into a supply bore ( 35 ) arranged in the force-transmitting arrangement ( 4 ).

1. Force-transmitting arrangement for a valve train of an internal-combustion engine comprising a hydraulic valve play compensation device with a hollow cylindrical compensation piston, which borders, on one end, a working space of the valve play compensation device and borders, on an other end, a hydraulic medium reservoir, which is used for supplying the working space and which is connected to a hydraulic medium supply of the internal-combustion engine, wherein a run-off safety device at least partially prevents a hydraulic medium flow from the hydraulic medium reservoir in a direction of the hydraulic medium supply, the hydraulic medium reservoir includes an inner storage space enclosed by the compensation piston and at least one outer storage space located outside of the compensation piston, wherein the run-off safety device extends between the hydraulic medium supply and hydraulic medium reservoir in a supply opening arranged in the force-transmitting arrangement, wherein the supply opening has in the supply direction a cross-sectional expansion facing the hydraulic medium reservoir with a shoulder, which is used as a seal seat for a sealing body of the run-off safety device. 
   
   
     2. Force-transmitting arrangement according to  claim 1 , wherein the sealing body is formed as a ball. 
   
   
     3. Force-transmitting arrangement according to  claim 2 , wherein the ball is a part of a ball non-return valve with a valve spring, which, on one hand, applies a force on the ball in a direction of the seal seat and, on the other hand, is supported by a valve cap arranged in the cross-sectional expansion. 
   
   
     4. Force-transmitting arrangement for a valve train of an internal-combustion engine comprising a hydraulic valve play compensation device with a hollow cylindrical compensation piston, which borders, on one end, a working space of the valve play compensation device and borders, on an other end, a hydraulic medium reservoir, which is used for supplying the working space and which is connected to a hydraulic medium supply of the internal-combustion engine, wherein a run-off safety device at least partially prevents a hydraulic medium flow from the hydraulic medium reservoir in a direction of the hydraulic medium supply, the hydraulic medium reservoir includes an inner storage space enclosed by the compensation piston and at least one outer storage space located outside of the compensation piston, wherein the run-off safety device extends between the hydraulic medium supply and hydraulic medium reservoir in a supply opening arranged in the force-transmitting arrangement, the run-off safety device permits hydraulic medium flow in a supply direction and blocks the flow in a direction opposite the supply direction, the run-off safety device is formed as a seat valve, the force-transmitting arrangement comprises a tappet for actuating a hollow cylindrical tappet push rod, and at least one outer storage space is formed by a hollow space of the tappet push rod. 
   
   
     5. Force-transmitting arrangement according to  claim 4 , wherein the tappet is switchable via a locking mechanism, which permits an at least partial disruption in a transfer of movement from a first tappet part to a second tappet part, which can telescope relative to the first tappet part and which activates the tappet push rod. 
   
   
     6. Force-transmitting arrangement for a valve train of an internal-combustion engine comprising a hydraulic valve play compensation device with a hollow cylindrical compensation piston, which borders, on one end, a working space of the valve play compensation device and borders, on an other end, a hydraulic medium reservoir, which is used for supplying the working space and which is connected to a hydraulic medium supply of the internal-combustion engine, wherein a run-off safety device at least partially prevents a hydraulic medium flow from the hydraulic medium reservoir in a direction of the hydraulic medium supply, the hydraulic medium reservoir includes an inner storage space enclosed by the compensation piston and at least one outer storage space located outside of the compensation piston, wherein the run-off safety device extends between the hydraulic medium supply and hydraulic medium reservoir in a supply opening arranged in the force-transmitting arrangement, the run-off safety device permits hydraulic medium flow in a supply direction and blocks the flow in a direction opposite the supply direction, the run-off safety device is formed as a seat valve, the force-transmitting arrangement comprises a tappet for actuating a hollow cylindrical tappet push rod, the at least one outer storage space comprises a hollow space of the tappet push rod, the tappet is switchable via a locking mechanism, which permits an at least partial disruption in a transfer of movement from a first tappet part to a second tappet part, which can telescope relative to the first tappet part and which activates the tappet push rod, and the supply opening extends into a connecting piece, which is located between an annular channel and an annular space of the second tappet part.